Deep Sleep Labyrinth of the Forsaken takes the player into the story of Amy, a veterinarian who is confronted with the death of her long-lost brother, Thomas. He was obsessed with lucid dreams and theories about alternate realities, ideas that Amy herself believed to be fiction. However, the journals she finds contain entries that gradually move from seeming nonsense to plausible accounts. On these pages, the heroine finds a compelling reason to doubt the death of her relative, which begins her descent into his world.